Document and Entity Information
Mar. 10, 2022
Cover [Abstract]  
Document Type 8-K
Amendment Flag false
Document Period End Date Mar. 10, 2022
Entity Registrant Name Graybug Vision, Inc.
Entity Central Index Key 0001534133
Entity Emerging Growth Company true
Entity Ex Transition Period false
Entity File Number 001-39538
Entity Incorporation, State or Country Code DE
Entity Tax Identification Number 45-2120079
Entity Address, Address Line One 203 Redwood Shores Parkway
Entity Address, Address Line Two Suite 620
Entity Address, City or Town Redwood City
Entity Address, State or Province CA
Entity Address, Postal Zip Code 94065
City Area Code 650
Local Phone Number 487‑2800
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Title of 12(b) Security Common Stock, $0.0001 par value per share
Trading Symbol GRAY
Security Exchange Name NASDAQ